Fiber distribution hub with swiveling frame body

ABSTRACT

A fiber distribution hub configured to house a patch panel includes a plurality of walls forming a chamber, a first shelf attached to a first wall of the plurality of walls in the chamber, a first track supported by the first shelf, and a frame body configured to support the patch panel and to be coupled with the first shelf via the first track. The frame body is configured to shift along the first track between a stored position, a front-exposed position, and a back-exposed position.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.16/834,536 filed Mar. 30, 2020, pending, which claims the benefit ofU.S. Provisional Application No. 62/825,333 filed Mar. 28, 2019, thedisclosures of which are incorporated by reference herein in theirentireties.

TECHNICAL FIELD

The present disclosure generally relates to cabinets for storinginformation and communication system components.

BACKGROUND

Patch panels used in information and communication systems are oftendensely packed in small cabinets in small storage spaces, such as hutsor data centers. Service technicians often have to access the patchpanels to service, maintain, test, modify, and/or configure them. Thismay entail removing panels from the cabinet, adding panels, plugging newfibers into the patch panels, and/or removing fibers. Accessing thecabinets in such small places and accessing cards within densely packedcabinets is difficult and tedious.

The background discussion is intended to provide information related tothe present disclosure which is not necessarily prior art.

SUMMARY

In accordance with various embodiments of the present disclosure, afiber distribution hub configured to house patch panels includes aplurality of walls forming a chamber, a door hingedly attached to one ofthe plurality of walls, a first shelf attached to a second wall of theplurality of walls, a first pair of tracks configured to be supported onthe first shelf and comprising portions that are parallel to one anotherand portions that are convergent to one another, a second shelf attachedto the second wall, a second pair of tracks configured to be supportedon the second shelf and comprising portions that are parallel to oneanother and portions that are convergent to one another, and a framebody configured to shift between a stored position, a front-exposedposition, and a back-exposed position. The frame body includes a framefor attaching patch panels and having a top portion, a bottom portion, afront portion that protrudes from the chamber when the frame body is inthe front-exposed position, and a back portion that protrudes from thechamber when the frame body is in the back-exposed position, a pair oftop pivot pins attached to the top portion of the frame, a pair ofbottom pivot pins attached to the bottom portion of the frame, and acable shelf attached to the top portion of the frame above the firstshelf. The pair of top pivot pins are configured to be slidingly engagedwith the first pair of track, the pair of bottom pivot pins areconfigured to be slidingly engaged with the second pair of tracks, andthe cable shelf are configured to support fiber optic cables connectedto the patch panels away from a path of the frame body.

According to some embodiments of the disclosure, a fiber distributionhub configured to house a patch panel includes a plurality of wallsforming a chamber, a first shelf attached to a first wall of theplurality of walls in the chamber, a first track supported by the firstshelf, and a frame body configured to support the patch panel and to becoupled with the first shelf via the first track. The frame body isconfigured to shift along the first track between a stored position, afront-exposed position, and a back-exposed position.

In some aspects of the fiber distribution hub, a cable wrap is attachedto a second wall of the plurality of walls inside the chamber.

According to various aspects of the fiber distribution hub, a door ishingedly attached to one of the plurality of walls.

In various aspects of the fiber distribution hub, a power outlet ispositioned in the inner chamber.

According to some aspects, the fiber distribution hub includes a secondshelf attached to the first wall and a second track supported by thesecond shelf, and the frame body is at least partially supported by thesecond shelf via the second track.

In some aspects of the fiber distribution hub, the frame body includes aframe for attaching the patch panel and having a top portion, a bottomportion, a front portion that protrudes from the chamber when the framebody is in the front-exposed position, and a back portion that protrudesfrom the chamber when the frame body is in the back-exposed position.

According to various aspects, the frame body includes a top pivot pinattached to the top portion of the frame, and the top pivot pin isconfigured to be slidingly engaged with the first track.

In various aspects of the fiber distribution hub, the frame bodyincludes a bottom pivot pin attached to the bottom portion of the frame,and the bottom pivot pin is configured to be slidingly engaged with thesecond track.

According to some aspects of the fiber distribution hub, the frame bodyincludes a cable shelf attached to the top portion of the frame abovethe first shelf, and the cable shelf is configured to support a fiberconnected to the patch panel away from a path of the frame body.

In some aspects of the fiber distribution hub, the cable shelf isconfigured to define a space below the cable shelf that is wide enoughto surround the first shelf when the frame body shifts to the storedposition.

According to various aspects of the fiber distribution hub, the firsttrack includes a pair of slots.

In various aspects of the fiber distribution hub, the first trackcomprises two parts including portions that are convergent.

According to various aspects of the disclosure, a frame support assemblyconfigured to support a patch panel includes a first shelf, a firsttrack supported by the first shelf, and a frame body configured tosupport the patch panel and to be coupled with the top shelf via thefirst track. The frame body is configured to shift along the first trackbetween a stored position, a front-exposed position, and a back-exposedposition.

The present disclosure solves the above-described problems and otherproblems and provides a distinct advance in the art of fiberdistribution hubs for information and communication systems. In someaspects, the present disclosure provides a fiber distribution hub thatis smaller and efficiently occupies space while still providing accessto patch panels and other components therein.

In the embodiments described herein, the frame body is configured tosupport one or more patch panels and to be engaged with the first shelfvia the first track, and the frame body is configured to shift along thetrack between a stored position, a front-exposed position, and aback-exposed position. By being shiftable between these positions, theframe body occupies less space when in the stored position. This enablesthe cabinet to be smaller in size, which allows for more space-efficientinstallation. Additionally, by being able to shift between afront-exposed position and a back-exposed position, both sides of thepatch panels are accessible without occupying too much additionallyspace when in said positions.

This summary is provided to introduce a selection of concepts in asimplified form that are further described below in the detaileddescription. This summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used to limit the scope of the claimed subject matter. Advantages ofthese and other embodiments will become more apparent to those skilledin the art from the following description of the exemplary embodimentswhich have been shown and described by way of illustration. As will berealized, the present embodiments described herein may be capable ofother and different embodiments, and their details are capable ofmodification in various respects. Accordingly, the drawings anddescription are to be regarded as illustrative in nature and not asrestrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

The Figures described below depict various aspects of systems andmethods disclosed therein. It should be understood that each Figuredepicts an embodiment of a particular aspect of the disclosed system andmethods, and that each of the Figures is intended to accord with apossible embodiment thereof. Further, wherever possible, the followingdescription refers to the reference numerals included in the followingFigures, in which features depicted in multiple Figures are designatedwith consistent reference numerals. The present embodiments are notlimited to the precise arrangements and instrumentalities shown in theFigures.

FIG. 1 is a perspective view of a fiber distribution hub constructed inaccordance with an embodiment of the present disclosure;

FIG. 2 is a front perspective view of the fiber distribution hub of FIG.1 with a frame body in a stored position;

FIG. 3 is a front perspective view of the fiber distribution hub of FIG.1 with the frame body in a front-exposed position;

FIG. 4 is a perspective view of the frame body of FIG. 1 in aback-exposed position;

FIG. 5 is an exploded perspective view of the frame body of FIG. 4;

FIG. 6 is a perspective view of the frame body of FIG. 4;

FIG. 7 is a right-side perspective view of the frame body of FIG. 4;

FIG. 8 is a left-side perspective view of the frame body of FIG. 4;

FIG. 9 is a front perspective view of the fiber distribution hub of FIG.1 with the frame body in a back-exposed position; and

FIG. 10 is a schematic illustration of a fiber distribution system usinga fiber distribution hub.

The Figures depict exemplary embodiments for purposes of illustrationonly. One skilled in the art will readily recognize from the followingdiscussion that alternative embodiments of the systems and methodsillustrated herein may be employed without departing from the principlesof the disclosure described herein.

DETAILED DESCRIPTION

The embodiment(s) described, and references in the specification to “oneembodiment”, “an embodiment”, “an example embodiment”, etc., indicatethat the embodiment(s) described may include a particular feature,structure, or characteristic, but every embodiment may not necessarilyinclude the particular feature, structure, or characteristic. Moreover,such phrases are not necessarily referring to the same embodiment.Further, when a particular feature, structure, or characteristic isdescribed in connection with an embodiment, it is understood that it iswithin the knowledge of one skilled in the art to effect such feature,structure, or characteristic in connection with other embodimentswhether or not explicitly described.

FIG. 10 schematically illustrates a fiber optic distribution system1301. As shown in FIG. 10, fiber optic distribution system 1301 caninclude a service provider location 1303 and one or more accessterminals 1305. Service provider location 1303 may be a service providercentral office or a local service provider supply location. A fiberdistribution hub (FDH) 1300 optically couples service provider location1303 to access terminal 1305. FDH 1300 can receive one or moremulti-fiber feeder cables 1307 from service provider location 1303. FDH1300 provides optical signals to end users 1311 by one or moredistribution cables 1309 that interface access terminal 1305. End users1311 receive the optical signals from access terminal 1305 through oneor more drop cables 1313. A person skilled in the relevant art wouldunderstand FDH 1300 can be used in fiber optic distribution systems thatvary from the one illustrated in FIG. 10. For example, FDHs can be usedin high fiber density applications such as data centers.

FIG. 1 illustrates an exemplary fiber distribution hub 10 in accordancewith various aspects of the disclosure. The fiber distribution hub 10constructed according to embodiments of the present disclosure may beused to store various electronic and fiber optic equipment. Theelectronic and fiber optic equipment may include one or more devices 12and one or more patch panels 14, 16 with one or more fiber optic cables18 and/or electronic wires 20 connected thereto. The cabinet 10 may beinstalled on a wall or other surface and broadly comprises a number ofwalls (described below) that define an interior chamber 22, a door 24that closes or provides access to the chamber 22, a frame body supportsystem 26, and a frame body 28.

The walls may include a left-side wall 30, a bottom wall 32, aright-side wall 34, a top wall 36, and a back wall 38 that together forma box-like structure which encloses the chamber 22. One or more cablewraps 40 and a device shelf 42 may be mounted to the left-side wall 30inside the chamber 22. The fiber optic cables 18 may be wrapped aroundthe cable wraps 40 for storage purposes. The device shelf 42 providessupport for one or more devices 12. The bottom wall 32 may include afiber optic cable port 44 for receiving a fiber optic cable 46 fromoutside the chamber. An electrical outlet 48 connected to an externalpower source (not shown) may be mounted on the back wall 38 forconnecting one or more of the patch panels 14, 16 and/or the device 12to the power source.

The door 24 is pivotally connected to the left-side wall 30 via a hingeor other connection and is shiftable between opened and closedpositions. While the figures depict the cabinet 10 forming a box-likestructure, the cabinet 10 may form any number of shapes and have anynumber of walls without departing from the scope of the presentdisclosure.

The frame body support system 26 is attached to the back wall 38 andsupports the frame body 28 so that the frame body 28 is shiftablebetween a stored position (as illustrated in FIG. 2), a front-exposedposition (as illustrated in FIG. 3), and a back-exposed position (asillustrated in FIG. 4). Turning to FIG. 5, the frame body support system26 may comprise a top shelf 50, a bottom shelf 52, and tracks 54, 56supported on the shelves 50, 52. The tracks 54, 56 are configured toguide the frame body 28 to shift from the stored position, thefront-exposed position, and the back-exposed position. The track 54 onthe top shelf 50 may mirror the track 56 on the bottom shelf 52. Thetracks 54, 56 may be attached to the shelves 50, 52 or incorporatedthereto. For example, each track 54, 56 may comprise a pair of slots 58,60, 62, 64 or grooves that receive portions of the frame body 28. Theslots 58, 60 of the first track 54 may include portions 66, 68 that areparallel to one another. The slots 58, 60 of the first track 54 may alsoinclude portions 70, 72 that are convergent to one another. Likewise,the slots 62, 64 of the second track 56 may include portions 74, 76 thatare parallel to one another and portions 78, 80 that are convergent toone another. The parallel portions 66, 68, 74, 76 allow the frame body28 to shift out of the chamber 22 a distance. The convergent portions70, 72, 78, 80 allow the frame body 28 to shift to either thefront-exposed position or the back-exposed position. However, it isforeseen that the tracks 54, 56 may take any shape without departingfrom the scope of the present disclosure. For example, the slots 58, 60,62, 64 may form opposing semi-circular lines.

The frame body 28 is supported on the cage support system 26 and isshiftable between the stored position, the front-exposed position, andthe back-exposed position. The frame body 28 may comprise a frame 82, atop engagement mechanism 84, a bottom engagement mechanism 86, and acable shelf 88. The frame 82 supports the patch panels 14, 16 and mayinclude a top portion 90, a bottom portion 92, a front portion 94, aback portion 96, and side portions 98, 100. The patch panels 14, 16 maybe attached to the front portion 94 of the frame 82 so that a pluralityof fiber ports 102 are accessible at the front portion 94, asillustrated in FIGS. 6 and 7. The patch panels 14, 16 may extend fromthe front portion 94 to the back portion 96 so that the back of thepatch panels 14, 16 are accessible at the back portion 96 (theback-exposed position of the frame body 28 being illustrated in FIG. 4,and the backsides of the patch panels 14, 16 being illustrated in FIG.8).

The top engagement mechanism 84 is attached to the top portion 90 of theframe 82, and the bottom engagement mechanism 86 is attached to thebottom portion 92 of the frame 82. The engagement mechanisms 84, 86 maycomprise any configuration that movably engages their respective tracks54, 56 of the frame body support system 26 so that the frame body 28 isshiftable between the stored position, the front-exposed position, andthe back-exposed position. For example, as illustrated, the engagementmechanisms 84, 86 may comprise pairs of fasteners 104 a, 104 b, 106 a,106 b extending through the slots 58, 60, 62, 64 and fastened to pairsof nuts 108, 110. In this embodiment, the fasteners 104 a, 104 b, 106 a,106 b may be moved along the parallel portions 66, 68, 74, 76 of theslots 58, 60, 62, 64 so that the frame body 28 shifts out from thestored position a distance. Then the either fasteners 104 a, 106 a orfasteners 104 b, 106 b may be moved along the convergent portions 70,72, 78, 80 of the slots 58, 60, 62, 64. Specifically, when the framebody 28 is moved to the front-exposed position, the fasteners 104 b, 106b move along their respective convergent portions 72, 80. When the framebody 28 is moved to the back-exposed position, the fasteners 104 a, 106a move along their respective convergent portions 70, 78. This allowsthe frame body 28 to be in the front-exposed or back-exposed positionswithout occupying too much additional space, which is important anduseful when the cabinet 10 is placed in small, difficult-to-reachspaces.

A friction-reducing system 112 may be used to reduce friction betweenthe engagement mechanisms 84, 86 and the tracks 54, 56. For example,pairs of shoulder washers 112, 114 may be positioned between theportions 90, 92 of the frame 82 and the shelves 50, 52 and configured toreceive the fasteners 104 a, 104 b, 106 a, 106 b. The shoulder washers112, 114 may be made of any material that reduces friction, such asnon-metal material, plastic, or the like. Additionally,friction-reducing washers 116, 118 may be positioned between the nuts108, 110 and the shelves 50, 52 to reduce friction between the nuts 108,110 and the shelves. The washers 116, 118 may also receive the fasteners104 a, 104 b, 106 a, 106 b and be made of any material that reducesfriction, such as non-metal material, plastic, or the like.

The cable shelf 88 is attached to the top portion 90 and supports fiberoptic cables 18 connected to the fiber ports 102 so that the fiber opticcables 18 stay out of the path of the shifting frame body 28. The cableshelf 88 may be attached to the front portion 94 and the back portion 96and define a space wide enough below the cable shelf 88 so that thecable shelf 88 moves around the top shelf 50 when the frame body 28 isshifting positions.

The cabinet 10 may also include locking mechanisms 120, 122 that areconfigured to hold the frame body 28 in the stored position. The lockingmechanisms 120, 122 may be attached to the side portion 98 and includebiased latching devices 124, 126 that engage receivers 128, 130connected to the shelves 50, 52. The latching devices 124, 126 maycomprise spring-biased bolts, and the receivers 128, 130 may comprisethreaded openings to which the spring-biased bolts may be engaged.However, the locking mechanisms 120, 122 may comprise any number ofdevices and/or configurations without departing from the scope of thepresent disclosure.

The cabinet 10 may include additional or less features than thosedescribed above without departing from the scope of the presentdisclosure. For example, the frame body 28 may be mounted directly to awall or other surface via one or more of the shelves 50, 52 and not beenclosed by the door 24 and walls 30, 32, 34, 36, 38.

In use, the door 24 of the cabinet 10 may be opened to access the framebody 28. The frame body 28 may be in the stored position in which thefasteners 104 a, 104 b, 106 a, 106 b are in the parallel portions 66,68, 74, 76 of the slots 58, 60, 62, 64. The locking mechanisms 84, 86may be locked, i.e., the latching devices 124, 126 may be engaged withthe receivers 128, 130.

To access the front portion 94 of the frame body 28 and therefore thefiber ports 102 of the patch panels 14, 16, the locking mechanisms 84,86 may be unlocked, i.e., the latching devices 124, 126 may bedisengaged from the receivers 128, 130. The frame body 28 may be shiftedto the front-exposed position. The front portion 94 of the frame 82 maybe pulled so that the fasteners 104 b, 106 b slide along the convergentportions 72, 80 of the slots 60, 64, and the fasteners 104 a, 106 arotate about a vertical axis. The front portion 94 and therefore theoutlets 102 of the patch panels 14, 16 are thereby accessible in thechamber 22.

To access the back portion 96 of the frame body 28 and therefore thefiber ports backsides of the patch panels 14, 16, the locking mechanisms84, 86 may be unlocked, i.e., the latching devices 124, 126 may bedisengaged from the receivers 128, 130. The frame body 28 may be shiftedto the back-exposed position. The back portion 96 of the frame 82 may bepulled so that the fasteners 104 a, 106 a slide along the convergentportions 70, 78 of the slots 58, 62, and the fasteners 104 b, 106 brotate about a vertical axis. The back portion 96 and therefore theoutlets backsides of the patch panels 14, 16 are thereby accessible inthe chamber 22.

To restore the frame body 28 to the stored position, the frame 82 may bepushed so that all the fasteners 104 a, 104 b, 106 a, 106 b slide backto their respective parallel portions 66, 68, 74, 76 until the framebody 28 is positioned in the stored position inside the chamber 22. Thelocking mechanisms 120, 122 may then be engaged to hold the frame body28 in the stored position, and the door 24 may be closed.

Definitions

It should be understood that the following is not intended to be anexclusive list of defined terms. Other definitions may be provided inthe foregoing description, such as, for example, when accompanying theuse of a defined term in context.

As used herein, the terms “a,” “an,” and “the” mean one or more.

As used herein, the term “and/or,” when used in a list of two or moreitems, means that any one of the listed items can be employed by itselfor any combination of two or more of the listed items can be employed.For example, if a feature is described as containing components A, B,and/or C, the composition can contain A alone; B alone; C alone; A and Bin combination; A and C in combination, B and C in combination; or A, B,and C in combination.

As used herein, the terms “comprising,” “comprises,” and “comprise” areopen-ended transition terms used to transition from a subject recitedbefore the term to one or more elements recited after the term, wherethe element or elements listed after the transition term are notnecessarily the only elements that make up the subject.

As used herein, the terms “having,” “has,” and “have” have the sameopen-ended meaning as “comprising,” “comprises,” and “comprise” providedabove.

As used herein, the terms “including,” “include,” and “included” havethe same open-ended meaning as “comprising,” “comprises,” and “comprise”provided above.

CLAIMS NOT LIMITED TO DISCLOSED EMBODIMENTS

The preferred forms of the invention described above are to be used asillustration only, and should not be used in a limiting sense tointerpret the scope of the present disclosure. Modifications to theexemplary embodiments, set forth above, could be readily made by thoseskilled in the art without departing from the spirit of the presentdisclosure.

The inventors hereby state their intent to rely on the Doctrine ofEquivalents to determine and assess the reasonably fair scope of thepresent disclosure as it pertains to any apparatus not materiallydeparting from but outside the literal scope of the disclosure as setforth in the following claims.

We claim:
 1. A fiber distribution hub configured to house patch panels,the fiber distribution hub comprising: a plurality of walls forming achamber; a door hingedly attached to one of the plurality of walls; acable wrap attached to a first wall of the plurality of walls inside thechamber; a first shelf attached to a second wall of the plurality ofwalls; a first pair of tracks configured to be supported on the firstshelf and comprising portions that are parallel to one another andportions that are convergent to one another; a second shelf attached tothe second wall; a second pair of tracks configured to be supported onthe second shelf and comprising portions that are parallel to oneanother and portions that are convergent to one another; and a framebody configured to shift between a stored position, a front-exposedposition, and a back-exposed position, the frame body including: a framefor attaching patch panels and having a top portion, a bottom portion, afront portion that protrudes from the chamber when the frame body is inthe front-exposed position, and a back portion that protrudes from thechamber when the frame body is in the back-exposed position, a pair oftop pivot pins attached to the top portion of the frame, the pair of toppivot pins being configured to be slidingly engaged with the first pairof tracks, a pair of bottom pivot pins attached to the bottom portion ofthe frame, the pair of bottom pivot pins being configured to beslidingly engaged with the second pair of tracks, and a cable shelfattached to the top portion of the frame above the first shelf, thecable shelf being configured to support fiber optic cables connected tothe patch panels away from a path of the frame body.
 2. A fiberdistribution hub configured to house a patch panel, the fiberdistribution hub comprising: a plurality of walls forming a chamber; afirst shelf attached to a first wall of the plurality of walls in thechamber; a first track supported by the first shelf; and a frame bodyconfigured to support the patch panel and to be coupled with the firstshelf via the first track, wherein the frame body is configured to shiftalong the first track between a stored position, a front-exposedposition, and a back-exposed position.
 3. The fiber distribution hub ofclaim 2, further comprising a cable wrap attached to a second wall ofthe plurality of walls inside the chamber.
 4. The fiber distribution hubaccording to claim 2, further comprising a door hingedly attached to oneof the plurality of walls.
 5. The fiber distribution hub according toclaim 2, further comprising a power outlet positioned in the innerchamber.
 6. The fiber distribution hub according to claim 2, furthercomprising a second shelf attached to the first wall and a second tracksupported by the second shelf, wherein the frame body is at leastpartially supported by the second shelf via the second track.
 7. Thefiber distribution hub according to claim 2, wherein the frame bodyincludes a frame for attaching the patch panel and having a top portion,a bottom portion, a front portion that protrudes from the chamber whenthe frame body is in the front-exposed position, and a back portion thatprotrudes from the chamber when the frame body is in the back-exposedposition.
 8. The fiber distribution hub of claim 7, wherein the framebody includes a top pivot pin attached to the top portion of the frame,the top pivot pin being configured to be slidingly engaged with thefirst track.
 9. The fiber distribution hub according to claim 6, whereinthe frame body includes a bottom pivot pin attached to the bottomportion of the frame, the bottom pivot pin being configured to beslidingly engaged with the second track.
 10. The fiber distribution hubaccording to claim 6, wherein the frame body includes a cable shelfattached to the top portion of the frame above the first shelf, thecable shelf being configured to support a fiber connected to the patchpanel away from a path of the frame body.
 11. The fiber distribution hubaccording to claim 10, wherein the cable shelf is configured to define aspace below the cable shelf that is wide enough to surround the firstshelf when the frame body shifts to the stored position.
 12. The fiberdistribution hub according to claim 2, wherein the first track comprisesa pair of slots.
 13. The fiber distribution hub according to claim 2,wherein the first track comprises two parts including portions that areconvergent.
 14. A frame support assembly configured to support a patchpanel, the frame support assembly comprising: a first shelf; a firsttrack supported by the first shelf; and a frame body configured tosupport the patch panel and to be coupled with the top shelf via thefirst track, wherein the frame body is configured to shift along thefirst track between a stored position, a front-exposed position, and aback-exposed position.
 15. The frame support assembly according to claim14, wherein the frame body includes a frame for attaching a patch paneland having a top portion, a bottom portion, a front portion, and a backportion.
 16. The frame support assembly according to claim 15, whereinthe frame body includes a top pivot pin attached to the top portion ofthe frame, the top pivot pin being configured to be slidingly engagedwith the first track.
 17. The frame support assembly according to claim15, wherein the frame body includes a bottom pivot pin attached to thebottom portion of the frame, the bottom pivot pin being configured to beslidingly engaged with the second track.
 18. The frame support assemblyaccording to claim 14, wherein the frame body includes a cable shelfattached to the top portion of the frame above the first shelf, thecable shelf being configured to support a fiber connected to the patchpanel away from a path of the frame body.
 19. The frame support assemblyaccording to claim 18, wherein the cable shelf is configured to define aspace below the cable shelf that is wide enough to surround the firstshelf when the frame body shifts to the stored position.